Inadequate Circulator Pump?

[John.g]

OK thanks again, can see tomorrow what the 70C does, if anything, you will soon know as the boiler dT will decrease if the pump is circulating more.

 

[JC22024]

OK thanks again, can see tomorrow what the 70C does, if anything, you will soon know as the boiler dT will decrease if the pump is circulating more.

Thanks I did turn it down more this morning and ran for 1.5 hrs before I left for work on downstairs zone. Didn't appear to make a difference on the rads not heating decently. Indeed they felt cooler. But will be sure to test this with new pump also incase the boiler is actually boiling the water at high settings! Which it could well be too adding to problems.

 

[John.g]

Presume boiler only ran continuously for 20 minutes or so and then started cycling??.

 

[JC22024]

Presume boiler only ran continuously for 20 minutes or so and then started cycling??.

Correct yes. I did get the olives etc this morning and DHL delivered new pump. So I'll fit it tonight when home from work, refill and properly time the boiler start up run time on GF zone. And see if the rads perform better. Fingers crossed!

 

[JC22024]

System draining down, this is the water coming out (I believe the system shouldn't have blockages. Water is always clean coming out)

 

[JC22024]

Pretty good difference comparing pump to pump opening

 

[John.g]

Is there much of a build up on the Wilo impeller vanes??. or is that the Alpha?.

 

[ShaunCorbs]

Note it will be brown / black this is normal

 

[John.g]

Here's mine, after 18 years, ready to be reinstalled when my smart pump packs up.

 

[John.g]

The impeller on JCs old (alpha/wilo) looks as if it has been in contact with something metallic as it seems a bit chewed up.

 

[JC22024]

The impeller on JCs old (alpha/wilo) looks as if it has been in contact with something metallic as it seems a bit chewed up.

I tried to split the Grundfos but it was the motor coming apart! So didn't want to break it altogether.

From what I can see the old vane looks OK?

 

[JC22024]

PS regards fitting new pump could the gate valves I have be considered a restriction?



They narrow to 15mm or so at pump inlet. Maybe this is nothing to worry about but If there may be a better way of connecting it let me know.

 

[ShaunCorbs]

No there all the same sorry to say you can pipe straight to the pump but then there’s no valves

 

[JC22024]

Well the new pump appears to be working very well.

Boiler only on 20 mins and already can audibly hear the pipes clicking as they heat up in far room of house! Radiator that never heated is already heating up evenly.

Will let it fully warm up for next hour or so and see how it's doing but appears very promising

 

[John.g]

What pump setting? and what are boiler flow/return temps as flow rate can be calculated from this.